1
JEE Advanced 2022 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2 A double slit setup is shown in the figure. One of the slits is in medium 2 of refractive index $n_{2}$. The other slit is at the interface of this medium with another medium 1 of refractive index $n_{1}\left(\neq n_{2}\right)$. The line joining the slits is perpendicular to the interface and the distance between the slits is $d$. The slit widths are much smaller than $d$. A monochromatic parallel beam of light is incident on the slits from medium 1. A detector is placed in medium 2 at a large distance from the slits, and at an angle $\theta$ from the line joining them, so that $\theta$ equals the angle of refraction of the beam. Consider two approximately parallel rays from the slits received by the detector. Which of the following statement(s) is(are) correct?

A
The phase difference between the two rays is independent of $d$.
B
The two rays interfere constructively at the detector.
C
The phase difference between the two rays depends on $n_{1}$ but is independent of $n_{2}$.
D
The phase difference between the two rays vanishes only for certain values of $d$ and the angle of incidence of the beam, with $\theta$ being the corresponding angle of refraction.
2
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1 In a Young's double slit experiment, the slit separation d is 0.3 mm and the screen distance D is 1 m. A parallel beam of light of wavelength 600 nm is incident on the slits at angle $$\alpha$$ as shown in figure. On the screen, the point O is equidistant from the slits and distance PO is 11.0 mm. Which of the following statement(s) is/are correct?
A
For $$\alpha$$ = 0, there will be constructive interference at point P.
B
For $$\alpha = {{0.36} \over \pi }$$ degree, there will be destructive interference at point P.
C
For $$\alpha$$ = $$\alpha = {{0.36} \over \pi }$$ degree, there will be destructive interference at point O.
D
Fringe spacing depends on $$\alpha$$.
3
JEE Advanced 2017 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Two coherent monochromatic point sources $${S_1}$$ and $${S_2}$$ of wavelength $$\lambda = 600\,nm$$ are placed symmetrically on either side of the center of the circle as shown. The sources are separated by a distance $$d=1.8$$ $$mm.$$ This arrangement produces interference fringes visible as alternate bright and dark spots on the circumference of the circle. The angular separation between two consecutive bright spots is $$\Delta \theta .$$ Which of the following options is/are correct? A
The angular separation between two consecutive bright spots decreases as we move from P1 to P2 along the first quadrant.
B
At P2 the order of the fringe will be maximum.
C
A dark spot will be formed at the point P2.
D
The total number of fringes produced between P1 and P2 in the first quadrant is close to 3000.
4
JEE Advanced 2016 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
While conducting the Young's double slit experiment, a student replaced the two slits with a large opaque plate in the XY-plane containing two small holes that act as two coherent point sources (S1, S2) emitting light of wavelength 600 mm. The student mistakenly placed the screen parallel to the XZ-plane (for z > 0) at a distance D = 3 m from the mid-point of S1S2, as shown schematically in the figure. The distance between the source d = 0.6003 mm. The origin O is at the intersection of the screen and the line joining S1S2. Which of the following is(are) true of the intensity pattern on the screen?
A
Semi circular bright and dark bands centered at point O
B
The region very close to the point O will be dark
C
Straight bright and dark bands parallel to the X-axis.
D
Hyperbolic bright and dark bands with foci symmetrically placed about O in the x-direction
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